These are all Ad Free Recommendations
Camera: Apple iTouch 6th Generation
First off, your phone camera works fine as long as it's a relatively new phone. Don't let anyone tell you any different. I just opt for the Apple iTouch because I don't want to put my personal phone through the use and abuse when shooting 1,000's of photos in a day. I also chose the iTouch becuase I can drop photos seamlessly to my MacBook via Airdrop. I also bought mine refurbished.
Mailers and Boxes: USPS Supplies
I'm not a fan of spending money on shipping supplies if I can get them for free. Save your money and order yourself some FREE shipping supplies at USPS.com. You can also read my rant here.
Label Printer: DYMO LabelWriter 4XL Thermal Label Printer
If you can find this elsewhere for cheaper, go for it. I got both of mine from eBay. Whatever you do, don't buy it from Dymo.com unless they're having a 99% off sale. This printer will cut down your shipping time dramatically when you start doing volume. I own 2 because I have 1 as backup, yes it's that serious. You can read my in depth review here.
Printer Labels: AmazonBasics Multi-Purpose Labels for Label Printers
Generic labels works fine and I've always bought generic printer labels. Don't pay $37 at Dymo.com when you can get the same thing for 1/8 of the price elsewhere. As far as "voiding" the label printer because you used a generic label goes, I think it's a bunch of bull. Go with the generic labels like the ones made by Amazon Basics.
Grandma's Secret Spot Remover
I wouldn't be surprised if this stain remover contains some kind of VooDoo. Sometimes you have to be patient but Grandma's Secret Spot Remover took off grease with 2 applications...GREASE! Apply, wait 5 mins, dab then wipe is the process I use to take off grease, pen marks and other random stains on clothes.
Sooner or later you WILL run into a situation where a tag on your NWT item accidentally falls off. A tagging gun is the solution to this. I would buy both clear and black barb fasteners refills to accomodate to the original barb color. Don't pay more than $15 for this including fasteners.
OxiClean MaxForce Gel Stick
When I'm thrifting, there are times when I find a really nice piece with a couple of stains. Instead of wondering if the stains might come out in a wash, I'm usually fairly confident they will thanks to this pre-wash stain remover. Once in a while I might run across a stain that this gel stick won't work on but for the most part, it help takes off A LOT of stains.